Mustard Jar

I bought this about 45 yrs ago full of mustard. it had a metal lid on it that has since rusted away. approx 4ins high & 3ins in dia. The blue pattern on it is raised. painted or something, the base has a mark on it like a bird in flight and the number 12. There are 5 banners around the main body with the words mustard, senf, moutarde, esslingen a/nect'ar and hegstenberg, in them. I found one on ebay with its lid but no other info.